CWDM or CWDM or FWWDM orLWDM
Release time:
2023-08-16
Source:
WDM (Wavelength Division Multiplexing), bearing schemes include coarse wavelength division multiplexing (CWDM), dense wavelength division multiplexing (DWDM), medium wavelength division multiplexing (MWDM), and fine wavelength division multiplexing (LWDM). The following is a description of each program. 1. CWDM (Coarse Wavelength Division Multiplexer) CWDM(Coarse Wavelength Division Multiplexer) is a sparse wavelength division multiplexer, also known as a coarse wavelength division multiplexer. CWDM has 18 different wavelength channels, the different wavelengths of each channel are separated by 20nm, using wavelengths from 1270 nm to 1610 nm. CWDM supports fewer channels than DWDM because it is compact and cost-effective, making it an ideal solution for short-range communications. The biggest advantage of the CWDM system is its low cost, and the cost of the device is mainly reflected in the filter and laser. The wide wavelength interval of 20nm also brings the advantages of low requirements on the technical specifications of the laser and simplified structure of the optical multiplexer/demultiplexer to the CWDM. The structure is simplified, the yield is improved, so the cost is reduced. 2. DWDM (Dense Wavelength Division Multiplexer) DWDM(Dense Wavelength Division Multiplexer) is a dense wavelength division multiplexer. The channel spacing of DWDM is 1.6/0.8/0.4 nm(200GHz/100 GHz/50 GHz), which is much smaller than CWDM. Compared with CWDM, DWDM with tighter wavelength spacing can carry 8 to 160 wavelengths on one optical fiber, which is more suitable for long-distance transmission. With the help of EDFA, DWDM systems can work over thousands of kilometers. 3. FWDM (Filtered Chip Wavelength Division Multiplexer) FWDM(Filter Wavelength Division Multiplexing) filter chip wave division multiplexer, is based on the mature membrane filter technology. The filter-type wavelength division multiplexer can combine or separate light of different wavelengths in a wide wavelength range, and is widely used in erbium-doped optical amplifiers, Raman amplifiers and WDM optical fiber networks. 4. MWDM (Medium Wavelength Division Multiplexer) MWDM reuses the first 6 waves of CWDM, compresses the wavelength interval of 20nm of CWDM to 7nm, and uses TEC(Thermal Electronic Cooler, semiconductor refrigerator) temperature control technology to realize 1 wave expansion into 2 waves. In this way, the capacity improvement can be realized and the optical fiber can be further saved. MWDM is based on the CWDM 6 wave, the left and right offset 3.5nm is expanded to 12 waves (1267.5, 1274.5, 1287.5, 1294.5, 1307.5, 1314.5, 1327.5, 1334.5, 1347.5, 1354.5, 1367.5, 1374.5nm). 5. LWDM (Fine Wavelength Division Multiplexing) LWDM is a wavelength division multiplexing Lan-WDM technology based on Ethernet channels, also known as fine wavelength division multiplexing. Its channel spacing is 200~800GHz, this range is between DWDM(100GHz, 50GHz) and CWDM (about 3THz). LWDM uses 12 wavelengths in the 1269nm to 1332nm band in the O-band(1260nm to 1360nm) range, and the wavelength interval is 4nm(1269.23, 1273.54, 1277.89, 1282.26, 1286.66, 1291.1, 1295.56, 1300.05, 1304.58, 1309.14, 1313.73, 1318.35nm). The working wavelength of LWDM is characterized by being located near zero dispersion, small dispersion and good stability. At the same time, LWDM can support 12 waves 25G, capacity increase, can further save fiber.
WDM (Wavelength Division Multiplexing), bearing schemes include coarse wavelength division multiplexing (CWDM), dense wavelength division multiplexing (DWDM), medium wavelength division multiplexing (MWDM), and fine wavelength division multiplexing (LWDM). The following is a description of each program.
1. CWDM (Coarse Wavelength Division Multiplexer)
CWDM(Coarse Wavelength Division Multiplexer) is a sparse wavelength division multiplexer, also known as a coarse wavelength division multiplexer. CWDM has 18 different wavelength channels, the different wavelengths of each channel are separated by 20nm, using wavelengths from 1270 nm to 1610 nm.
CWDM supports fewer channels than DWDM because it is compact and cost-effective, making it an ideal solution for short-range communications. The biggest advantage of the CWDM system is its low cost, and the cost of the device is mainly reflected in the filter and laser.
The wide wavelength interval of 20nm also brings the advantages of low requirements on the technical specifications of the laser and simplified structure of the optical multiplexer/demultiplexer to the CWDM. The structure is simplified, the yield is improved, so the cost is reduced.
2. DWDM (Dense Wavelength Division Multiplexer)
DWDM(Dense Wavelength Division Multiplexer) is a dense wavelength division multiplexer. The channel spacing of DWDM is 1.6/0.8/0.4 nm(200GHz/100 GHz/50 GHz), which is much smaller than CWDM.
Compared with CWDM, DWDM with tighter wavelength spacing can carry 8 to 160 wavelengths on one optical fiber, which is more suitable for long-distance transmission. With the help of EDFA, DWDM systems can work over thousands of kilometers.
3. FWDM (Filtered Chip Wavelength Division Multiplexer)
FWDM(Filter Wavelength Division Multiplexing) filter chip wave division multiplexer, is based on the mature membrane filter technology. The filter-type wavelength division multiplexer can combine or separate light of different wavelengths in a wide wavelength range, and is widely used in erbium-doped optical amplifiers, Raman amplifiers and WDM optical fiber networks.
4. MWDM (Medium Wavelength Division Multiplexer)
MWDM reuses the first 6 waves of CWDM, compresses the wavelength interval of 20nm of CWDM to 7nm, and uses TEC(Thermal Electronic Cooler, semiconductor refrigerator) temperature control technology to realize 1 wave expansion into 2 waves. In this way, the capacity improvement can be realized and the optical fiber can be further saved.
MWDM is based on the CWDM 6 wave, the left and right offset 3.5nm is expanded to 12 waves (1267.5, 1274.5, 1287.5, 1294.5, 1307.5, 1314.5, 1327.5, 1334.5, 1347.5, 1354.5, 1367.5, 1374.5nm).
5. LWDM (Fine Wavelength Division Multiplexing)
LWDM is a wavelength division multiplexing Lan-WDM technology based on Ethernet channels, also known as fine wavelength division multiplexing. Its channel spacing is 200~800GHz, this range is between DWDM(100GHz, 50GHz) and CWDM (about 3THz).
LWDM uses 12 wavelengths in the 1269nm to 1332nm band in the O-band(1260nm to 1360nm) range, and the wavelength interval is 4nm(1269.23, 1273.54, 1277.89, 1282.26, 1286.66, 1291.1, 1295.56, 1300.05, 1304.58, 1309.14, 1313.73, 1318.35nm).
The working wavelength of LWDM is characterized by being located near zero dispersion, small dispersion and good stability. At the same time, LWDM can support 12 waves 25G, capacity increase, can further save fiber.
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